Different administration of drugs is to enhance the drug effects on the body, depending on the symptom of the patient. Below is an illustration showing therapeutic window. The goal and the challenge of the researchers is to minimize the drug toxicity to the body and to maximize the drug activity inside the body. In order to keep the drug concentration inside of blood at the therapeutic window, a sustainable drug release is desired. To achieve this, many nanotechnology drug platforms are available. The most common ones are liposomes and hydrogels.